“Smoke, Screened” is an investigative series by The California Newsroom, MuckRock and the Guardian on the large environmental impact of a little-noticed deregulatory tool found in the Clean Air Act. The provision in the Clean Air Act has allowed the Environmental Protection Agency to strike pollution from clean air tallies in more than 70 counties, enabling local regulators to claim the air was cleaner than it really was for more than 21 million Americans. The loophole allows regulators to forgive pollution, and avoid costly cleanup work, caused by “natural” or “uncontrollable” events, including wildfires.